For in-hex screws Contents 7 pieces Hexagon socket key number 42 2 2.5 3 4 5 6 8mm Metric Acc. to DIN ISO 2936 Chamfered nose ends facilitate insertion into the screw head GEDORE vanadium steel 61CrSiV5, zinc-plated Professionally tempered for a long service life The fiber course of the steel is not interrupted and thus retains its full strength, toughness and flexibility On key ring with quick release.